Telephone receiver



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judy 93929.' H. D. HBNELINE TELEPHONE RECEIVER Filedmay 201926 lNvl-:NToR Hams o. HINEUNE BY f /@MM ATTORNEY Patented July 16, 1929.

UNITED STATE-s HARRIS n. Hnvnnmn, or NEW YORK, 'N.FY.,- Asszenon y [1,721,217 PATENT OFFICE.

AMERICA, A conronAIoN or DELAWARE.

lTELarJIOlvE nncEIvER. I'

Application mea may 2O, 1926. serial un.l 110,336.

My invention relates to telephone devices.

and particularly to loud speaking telephone receiver devices. g

An object of my-invention is'to provide a telephone receiver device adapted to trans-- formation of substantial powers of vibratory electricalenergy into sound.

Another object ofniyinventionisto pro-'- vide a loudspeaker device adapted'to the translation of electrical energyintosound with the minimum distortionfrom natural resonant frequencies. A Another object of my invention is to'prvide aloud speaker device r* having a dia phragni and a diaphragm chamber. having a minimum volumetric capacity.

Another'ob-'ect of my invention Vis to :pro-

vide a loud speaker device vhaving'a diadoubling of the frequency and improper re- 'sponse to the impressed current. Diiiculty has also been encountered in the production of a diaphragm chamber having a sufficiently small volume to give satisfactoryreproduction of very high frequencies.

My invention provides'a telephone receiver` device in which the steadyv flux passes 4through the diaphragm onl transversely to the diaphragm surface. t further provides a conveniently small diaphragm chamber volume;

and provides easy and convenient assembly means for the construction of the device.

Other objects and structural details of my invention will be apparent from-the following description when read in connection with the accompanying drawing, wherein:

Figure 1 is a View in vertical elevation of my invention and, Figure 2 is a horizontal section of the embodiment.

Referring to the gures, I provide a tubular permanent magnet structure 1 having north and south poles as indicated. A. base member 2 is also providedhaving an inner tubular portion 3, and an outer tubular portion .4. A coil bobbin is provided, which may consist' of a bobbin cheek 5, pressed well down upon the tubular membep 3 and an addi- To `RADIO CORPORATION oF tional bobbin` cheek 6, pressed upon the i end of the tubular portion 3. tubular portion .4 may conveniently be' screwed upon a ring member 7, attached. to, or integral with the base member 2. A winding- 8 isplaced within the bobbin upon the tubular portion 3.. If the tubularportion 4 is threaded' upon the port-ion 7 as inticatefLthe coil 8- may be wound'directly upon the tube 3 between the bobbin cheeks` 5` and 6, or alter' natively, the tubula'rportion 4 may be made an integral part of the base member 2 and the coil 48 may thenbe wound upon a bobbin hav- The ing a tubular core and ittedover-the member 3. The bobbin cheek 4dis'hed'as shown'.

A top plate member 9 having a tubular portion 11 and-a larger tubular portion l2 threaded upon a ring.z portion 14 is provided. A bobbin cheek 15, acoil 16 and a dished coll cheek 17 are provided as before, a diaphragm 6 is conveniently made 18 is positioned between the bobbin cheeks 6 and 17 and the'whole assembly is clamped togetherbya coupling member 19. The top plate 9 is threaded on its periphery as indicated and a clamping ring 21 isprovided to clamp-the magnet 1 in the position shown.

y A nozzle member 22 is provided having an opening coaxially through the tubular member 11, and a horn member 23 preferably having a flare which follows an equation of logarithmic form is attached thereto.

The diameter of the opening through the member llmay preferably be about 1/4 o f an inchQ- 'The spacingat pointsA and B between the tubular members 3 and 11 and" the'diaphragm 18 may-'desirably be less than 1/16 of an'inch and may be as small as 1/64 'inch although a much'greater distance is suggested inthe Figure.

' In the Operation of my device a steady flux is provided bythe magnet 1 which Hows as 4indicated by the solid line'arrows, divided at the point of attachment of the tubular mem 'ber 12 to flow longitudinally through the members 11 and 12. A v'portion of the flux` .crosses the spaces A and B through the dia.-

to the plane of the diaphragm.

The coils 8 and 16v are wound in a way as to pppose each other and they accordinglyv through the diaphragm 18 is thus dependent upon the magnitude of current flowing in the coils 8 and 16, and varies with variations in the current, thus causing a varying pull upon the diaphragm 18, a movement thereof, and

. the production of sound vibrations thereby.

T e horn 23 may desirably have an overall length of ft. and a'terminal opening not less than 12 or 14 inchesin diameter, When so constructed practically uniform response in the production of sound is obtained from elec-` trical frequencies ranging from about 100 per second to about.12,000 per second, the lower value being determined by the length and terminal opening of .the horn 22 and the upper value being determined by the volume 'of the sound chamber surrounding the diaphragm 18, and the elasticity of the diaphragm.

' The construction, as indicated, permits the vutilization of a soun-d chamber ove-r the dia- `.phragm 18 having an extremely small volume,

and the removal of al1 of the steady flux from the diaphragm permits the utilization of an extremely' thin,v light, elastic, diaphragm, thereby enabling the device to re spond to very high frequencies.- .Simultaneously' the use of the large logarithmic 'shaped horn vloads the diaphragm suiiiciently Well so that it responds equally 'well to low frequencies. Y A

The device may desirably be supplied with vibratory current through a transformer, in

.order toremove the direct current component when the device is connected to a vacuum tubeY amplifier. This prevents the existence of a steady flux through the diaphragm' 18 due to the steady component `of the vacuum' tube' amplifier plate current. Y

By the device of my invention I am enabled to providea telephone receiver device which is capable of translating large powers of` vibratory. energy without distortion thereof and which is convenient to build and assemble and when constructed is rugged and durable. While I have shown but one embodiment of myl invention in t'he foregoing drawing l and description 1t 1s capable of various m0di fications therefrom without departing from the spirit thereof, and it is .desired therefore that only such limitations shall be imposed thereon as are required by the prior art or indicated by theappended claims.

I claim as my invention: v l. A telephone receiver device comprisingl a diaphragm, a magnet, pairs of coaxial pole pieces of unlike polarity attached thereto on opposite sides of said diaphragm, adapted to carry magnetic iiux transversely to said diaphragm and means for providing vibratory parallel flux in said diaphragm.

2. A telephone receiver device comprising a diaphragm, members forming a'chamber therearound, a permanent magnet, a pair of concentric tubular pole pieces disposed on opposite sides of said diaphragm and con. nectedto saidmagnet, a second pair of concentrictubular pole pieces disposed within said first named pair on opposite sides of said diaphragm and connected to said magnet, and a pair of concentricV windings mounted on one of said pairs of pole pieces.

sov

. 3. A telephone receiver device comprising 4. A telephone receiver device comprising a tubular permanent magnet having a plurality of concentric cylindrical poles at the opposite ends' thereof connected thereto, a diaphraglnmounted between said poles, and

f a pair of windings mounted on two of said cylindrical poles.A y

5. A telephone receiver device comprising a tubular permanent magnet'having poles. at

the extremities thereof, a diaphragm of a less diameter mounted in said magnet transversely thereof, pairs of concentric tubular pole pieces connected to said magnet, and disposed on opposite sides of said diaphragm, and a `winding on one of said poles.

6. In a telephone receiver device, a tubular magnet, a plurality of tubular coaxial pole pieces in said magnet vconnected thereto,

windino's mounted on two of said polepieces,

and a'zdiaphragm associated with saidp'ole pieces. Y

7. A telephone receiver device comprising a tubular ermanent magnet, a circular diaphragm of less diameter' positioned transversely therein, a plurality of symmetrical pole pieces cooperatingv with said diaphragm and said permanent magnet and coaxial therewith, and coils wound in opposition on two of said pole pieces. 1

8 .vA telephone receiver device, comprising a tubular permanent magnet, a circular diaphragm mounted therein coaxial therewith, a plurality of tubular pole` pieces'cooperat ing with said magnet and coaxial 4with said permanentmagnet anda winding mounted on one of said pole pieces.

9.A A telephone receiver device comprising a tubular permanent magnet, a circular diaphragm transversely therein, a plurality of pole pieces cooperating therewith and attached to said magnet, adapted to convey flux; therefrom through parallel concentric paths. and means comprising a winding for diverting` part of said flux ,from one polepiece to another in a path parallel to diaphragm.

10. In a telephone lreceiver device a diaphragm and a diaphragm chamber comprising disks of insulating material adapted to serve as hebbin cheeks.

11. In a telephlione receiver devicea dia- .'phragm and av plurality of pairs of c'oncentric pole pieces of equal length andbobbin cheeks cooperating therewith surrounding certain of saidpole pieces and supported between other ofsaid pole pieces. A

l2. In a telephone receiver device a conical diaphragm chamber of minimum volume comprising a conical bobbin cheek of insulating material anda tubular pole piece.

13. .In a telephone receiver device, a diaphragm, and a disk having a concave surface mounted on each side thereof the concave surfaces of said disks, being opposed te form a chamber for said diaphragm.

the plane of'said 14. In a telephone receiver device, a diaphragm, pairs of pole pieces on opposite sides` thereof, and a diaphragm chamber comprising disks mounted on one of said pairs of polepieces, and'clamped between another of said pairs ofpole pieces. l

I5. In a telephone receiver device, a mag'- net, pairs of pole pieces therein connected' thereto, a diaphragm, and a pair of disks forming a chamber for said diaphragm clamped between a pair of said pole pieces.

16. In a telephone receiver device, a magnet, pairs of tubular pole pieces attachedthereto, and a diaphragm between said pairs of pole pieces and supported by a pair of said pole pieces.

17. In a telephone receiver device, a pair of tubular pole pieces, and a metallic d iaphragm clamped between said pole piecesV but insulated therefrom.

. HARRIS D. HINELINE.

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